So, I run into some issues with my ARR's. Even though it does say "saved", the system is not changing the numbers within the "Own Vehicle Category" tab accordingly.
This happens either when I:
--> create a new ARR, every number input within the tab "Own Vehicle Category" gets changed to 0 after saving.
--> copy an existing ARR, every new number input within the tab "Own Vehicle Category" gets changed back to 0 after saving. Pre-existing number values within that tab (from copying an existing ARR) are kept / get changed back to their old value.